"Black box's text: "Cilan's Challenge：Pokemon Sommelier Showdown!!
Cilan's goal is mastery as a Pokemon Sommelier. In the midst of his travels, a confrontation between sommeliers occurs!"

The little Pink-haired girl's name is Momocchi, is part of the storyline in this ep. It involves her picking her first pokemon.
The top picture: "Which is the appropriate first partner[pokemon]? Picking which pokemon are most compatible for a person is one of the jobs of a Pokemon Sommelier. Out of the many Pokemon available, it's time to pick her first partner!"
The middle picture: "A Pokemon Sommelier, with A-Class certification, same as Dento, named Pinot Noir arrives. The one to pick Momocchi's perfect partner will be....?"
The bottom picture (Purrloin vs Crustle): "A battle takes place in order to choose what Pokemon will become Momocchi's partner. It's a huge conflict between Pinot Noir's Purrloin and Dento's Crustle!"